<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }
        .grey {
            color: grey;
        }
        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .container .row input {
            width: 260px;
            height: 30px;
        }
        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>留言板</h1>
        <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
        <div class="row">
            <span>谁:</span> <input type="text" name="" id="from">
        </div>
        <div class="row">
            <span>对谁:</span> <input type="text" name="" id="to">
        </div>
        <div class="row">
            <span>说什么:</span> <input type="text" name="" id="say">
        </div>
        <input type="button" value="提交" id="submit" onclick="submit()">
        <!-- <div>A 对 B 说: hello</div> -->
    </div>

    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
    <script>
        // function submit(){
        //     //1. 获取留言的内容
        //     var from = $('#from').val();
        //     var to = $('#to').val();
        //     var say = $('#say').val();
        //     if (from== '' || to == '' || say == '') {
        //         return;
        //     }
        //     //2. 构造节点
        //     var divE = "<div>"+from +"对" + to + "说:" + say+"</div>";
        //     //3. 把节点添加到页面上    
        //     $(".container").append(divE);

        //     //4. 清空输入框的值
        //     //赋值
        //     $('#from').val("");
        //     $('#to').val("");
        //     $('#say').val("");
            
        // }

        load();
function load() {
 $.ajax({
 type: "get",
 url: "/Message/getlist",
 success: function (result) {
 for (var message of result) {
 var divE = "<div>" + message.from + "对" + message.to + "说:" + 
message.say + "</div>";
 $(".container").append(divE);
 }
 }
 });
}
        function submit(){
            //获取输入框的内容
            var from=$("#from").val();
            var to=$("#to").val();
            var say=$("#say").val();
            //判断输入框是否为空
            if(from=="" || to=="" || say==""){
                alert("输入不能为空");
                return;
            }
        $.ajax({
            type:"post",
            url:"/Message/getmessage",
            contentType: "application/json",
            data: JSON.stringify({
                from:from,
                to:to,
                say:say
            }),
            success:function(result){
                if(result){
                    //构造节点
                    var divE="<div>"+from+"对"+to+"说:"+say+"</div>";
                    //添加到页面上
                    $(".container").append(divE);
                    //清空输入框的值
                    $('#from').val("");
                    $('#to').val("");
                    $('#say').val("");
                }else{
                    alert("留言失败");
                }
            }
        })
    }
    </script>
</body>

</html>